12-Position IDC Receptacle for Discrete Wire Harnesses
The JST 12HR-4K is a 12-position IDC receptacle from the HR series, terminated directly to discrete 24 AWG wire without a separate crimp terminal — the insulation displacement contacts pierce the wire jacket in one press operation. The closed-end feature blocks the back of the housing, preventing wire pushback or contamination from entering the contact area.
IDC Termination and Wire Fit
No stripping, no crimp tool for a separate terminal. The 1-row layout keeps the wire exit in a single plane, which simplifies bundling in a harness. The female socket contacts accept the mating male header pins from the HR series; the detent lock clicks when fully seated.
Selection Note for the Harness Builder
The 12HR-4K sits at 12 positions in the HR series — a mid-count option between smaller 2- to 10-position housings and larger 14- to 20-position ones. The closed-end housing is specific to this variant; open-end versions in the same series allow daisy-chaining wires through the back. For a harness that needs to pass wires through the housing rather than terminate at it, the open-end sibling is the correct pick.